Top Application Vulnerabilities Post-Deployment

This cheat sheet identifies critical application vulnerabilities that are often overlooked after deployment, particularly those that can be detected through black-box testing methods. It outlines several high-impact findings, including excessively verbose error messages, missing or misconfigured security headers, insecure redirects, sensitive data exposure via URLs, outdated JavaScript libraries, reflected cross-site scripting (XSS), and clickjacking. Each vulnerability is defined, and the cheat sheet explains how dynamic application security testing (DAST) tools can help identify these issues. Additionally, it provides practical solutions for mitigating these vulnerabilities, such as implementing generic error responses, applying security headers consistently, and avoiding sensitive data in URLs. The document serves as a resource for security teams aiming to enhance their application security by addressing common gaps that may arise post-deployment.